Abstract
This work aims to investigate based on the Strouhal number St and the flow structure, the dependence of flow classification on the Reynolds number Re in the wake of two staggered cylinders, with Re varying from 1.5 × 103 to 2.0 × 104. The cylinder center-to-center pitch, P * = P/d examined is 1.2–6.0 (d is the cylinder diameter), and the angle (α) between the incident flow and the line through the cylinder centers is 0°–90°. Two single hotwires were used to measure simultaneously the St behind each of the two cylinders at streamwise positions from x * = x/d = 2.5–15. While the present data reconfirms the flow structure modes previously reported, the dependence of the flow modes on P * and α exhibits an appreciable dependence on Re. The observation is connected to the Re effect on the generic features of a two-cylinder wake such as flow separation, boundary layer thickness, gap flow deflection, and vortex formation length.
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References
Hu JC, Zhou Y (2008) Flow structure behind two staggered circular cylinders, part 1. Downstream evolution and classification. J Fluid Mech 607:51–80
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Acknowledgments
YZ wishes to acknowledge support given to him from Natural Science Foundation of China through grants 11172085 and 50930007.
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© 2014 Springer-Verlag Berlin Heidelberg
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Wong, C.W., Zhou, Y., Alam, M.M. (2014). Reynolds Number Effect on Flow Classification Behind Two Staggered Cylinders. In: Zhou, Y., Liu, Y., Huang, L., Hodges, D. (eds) Fluid-Structure-Sound Interactions and Control. Lecture Notes in Mechanical Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40371-2_27
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DOI: https://doi.org/10.1007/978-3-642-40371-2_27
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